# WBT_CalcPacketbitmapSize

## C Specification

      #include <nitro/wbt.h>

      int WBT_CalcPacketbitmapSize(int block_size);

## Description

This calculates and acquires the receive bitmap buffer size that is required when receiving a specified size of data with the `WBT_GetBlock` function.

This function can only be used:

- In the case of a parent, after the `WBT_InitParent` function;
- In the case of a child, after the `WBT_RequestSync` function.

If the transmission packet size and the receive block data size are already known, the `WBT_PACKET_BITMAP_SIZE` macro obtains the same results.

## Arguments

`block_size` | The size of the data to be received.

## Return Values

Returns the bitmap buffer size required to receive the corresponding amount of data.

## See Also

``WBT_GetBlock`, `WBT_PACKET_BITMAP_SIZE``

## Revision History

09/21/2004 Initial version